Definition of "pseudoscience"

pseudoscience

noun
countable and uncountable, plural pseudosciences
1. Any body of knowledge that purports to be scientific or to be supported by science but which fails to comply with the scientific method.
  Quotations
  The fantastical pseudo-science of alchemy has in all ages had its numerous votaries …
  1796, James Pettit Andrews, Robert Henry, History of Great Britain, from the death of Henry viii. to the accession of James vi. of Scotland to the crown of England, page 87
  We had enough to do in this world. Life was a beautiful thing. The man who appreciated its real duties and beauties would have sufficient to employ him without dabbling in pseudo sciences which had their roots in frauds, exposed already a hundred times and yet finding fresh crowds of foolish devotees whose insane credulity and irrational prejudice made them impervious to all argument.
  1925 July – 1926 May, A[rthur] Conan Doyle, “(please specify the chapter number)”, in The Land of Mist (eBook no. 0601351h.html), Australia: Project Gutenberg Australia, published April 2019
2. Fictitious science as portrayed in science fiction.
  Quotations
  It pulls together first-rate pseudo-science and high-grade detective meller of the Spillane school (but entirely clean) and the result is fine read-and-forget entertainment.
  1952 November, Groff Conklin, Galaxy Science Fiction, page 122, column 1